Page end alarm for typewriters



March 18, 1947-.

ET. WICKLAND 2,417,532 PAGE END ALARM FOR TYYPEWRI'IERSY Filed May 4',1945 V EDWARD "5. WICKLANDP wwa Arfoau as.

m vemoa Patented Mar. 18, 1947 UNITED. STATES PATENT OFFICE 2,417,532PAGE END ALARM FOR TYPEWRITERS Edward T.-Wickland, Roundup, Mont.Application May 4, 1945, Serial No. 591,971 4 Claims. (o1.197-1s9) ofthe machine to control the sounding of an alarm when the end of thesheet of paper is reached and also embodying means forrenderinginoperative the signalling mechanism while inserting a sheet ofpaper on the platen, or when it is desired to shift or adjust the sheetof paper thereon after the same has been inserted on the platen.

Another object of the invention is to provide a typewriter attachment ofthis character which may be mounted on a conventional typewriter withoutnecessitating any material changes or alterations therein.

A still further object is to provide a device of this character ofsimple and practical construction, which is eflicient and reliable inuse, relatively inexpensive to manufacture and otherwise well adaptedfor the purposes for which the same is intended.

Other objects and advantages reside in the details of construction andoperation as more fully hereinafter described and claimed, referencebeing had to the accompanying drawing forming part hereof, wherein likenumerals refer to like parts throughout, and in which:

Figure 1 is a fragmentary end elevational view of a typewriter carriageshowing my invention attached thereto.

Figure 2 is a top plan view.

Figure 3 is a perspective view of one of the adjustable signal operatinglugs.

Referring now to the drawing in detail, wherein for the purpose ofillustration I have disclosed a preferred embodiment of the invention,the numeral 5 designates a part of a typewriter carriage of conventionalconstruction and on which the platen or roller 6 is operatively mounted,the platen being adapted for feeding the sheet of paper l thereon in theusual manner.

The platen B is formed adjacent one end thereof with an annular groove 8and in which one end of a substantially bell crank lever B is adapted toride in a position under the platen, the lever 9 being pivotally mountedintermediate its ends on a part of the carriage 5 by means of a screw Abar I I extends in parallel relation behind the platen 6 and is providedat its ends with upwardly extending hangers I2 pivoted at their upperends to a rod I3 carried by the carriage, to swingably support the barfor forward and rearward swinging movement relative to the platen. a

One end of the bell crank lever 9 extends substantially horizontallyforwardly underthe platen.

6, while the other end of the bell crank lever extends upwardly, asindicated at I Land is pivotally attached to one of the hangers I2 bymeans of a link I5, whereby a raising and lowering movement of the frontend of the lever 9,

will cause a front and rear swinging movement of the bar I I, asindicated by the full and dotted line positions in Figure 1 of thedrawing.

A coil spring I 6 is attached at one end'to a part of the carriage 5 andis attached at its other end to the upwardly extending end portion I4 ofthe bell crank lever to yieldably urge the front end of the leverupwardly into the groove 8 and to urge the bar I I rearwardly.

A bell I! is attached to an arm I8 projecting rearwardly of the frame ofthe machine and a clapper or hammer I9 is pivoted intermediate its endsto the frame and extends in a substantially parallel relation to the barII. One end of the clapper I9 is formed with a head 20 adapted forstrikingthe bell and the other end of the clapper 2| disposed in thepath of a rearwardly projectlng beveled lug 22 carried by the bar II.

The upper and lower surfaces of the bar II are formed with transverselyextending slots 23 in which the upper and lower legs 24 and 25projecting from the. rear face of the lug 22 are adapted for slidableengagement thereby to adjust the lug 22 longitudinally on the bar I I,in accordance with the period of movement of the carriage at which it isdesired to sound the alarm.

One or more reserve lugs 26 may be carried by the bar II by insertingthe arms 24 and 25 in the slots 23 at the side of the bar opposite fromthe lug 2|, as indicated in Figure 2 of the drawing.

In order to prevent interference with the feeding of the sheet of paperI on the platen 6 by the bell crank lever 9, a lever 21 is pivoted atone end to a part of the carriage 5 for forward and rear- ,ward swingingmovement, the lever being provided to ride behind the upwardly extendingend M of the lever to move the same forwardly and to swing the front endof the lever 9 downwardly out of engagement with the groove 8 of theplaten, as shown by the full line position of Figure 1. The sheet ofpaper I may then be fed on the platen 6 to cover the groove 8 and thecam 28 is then released from the upper end 14 of the bell crank lever bymeans of the lever 21 which is moved into its dotted line position, asshown in Figure 1, and the paper I will then prevent the front end ofthe lever 9 from entering the groove 8 and the bar ll will thus bemaintained in its forward position, so that during the backward andforward movement of the carriage, the lug 22 will not strike the lug 2|of the clapper.

However, when the end of the sheet of paper 1 has been reached duringthe typing thereof, the groove 8 will be uncovered, thus permitting thelever 9 to enter the groove and to swing the bar H rearwardly so thatwhen the carriage again travels along the machine, the lug 22 willstrike the lug 2| and pivot the clapper l9 to exert tension on a coilspring 29 connecting the clapper to a stationary part of the machinewhereby to cause the clapper to strike the hell I! and thus sound thealarm to indicate that the end of the page has been reached.

It is believed the details of construction, manner of operation andadvantages of the device will be readily understood from the foregoingwithout further detailed explanation.

While 1 have herein shown and described a preferred embodiment of theinvention, it is to be understood that changes in the details ofconstruction may be resorted to which will fall within the scope of theinvention as claimed.

Having thus described the invention, what I claim is:

1. A page end alarm for typewriters having a carriage provided with aplaten, said platen having an annular groove normally covered by a sheetof paper placed thereon, a bell mounted on a stationary part of themachine and including a pivoted clapper having a laterally projectinglug at one end, a bar pivotally suspended on the carriage for forwardand rearward swinging movement, normally inactive means connected to thebar and operable to enter the groove upon uncovering thereof, by thepaper to swingably actuate the bar rearwardly toward said lug of theclapper, and a lug adi'ustably carried by the bar for engaging saidfirst-named lug.

2. A page end alarm for typewriters having a carriage provided with aplaten, said platen having an annular groove normally covered by a sheetof paper placed thereon, a bell mounted on a stationary part of themachine and including a pivoted clapper having a laterally projectinglug at one end, a bar pivotally suspended on the 3,0

carriage for forward and rearward swinging movement, normally inactivemeans connected to the bar and operable to enter the groove uponuncovering thereof by the paper to swingably actuate the bar rearwardlytoward said lug of the clapper, said bar having transverselongitudinally spaced grooves, and a lug having an arm selectivelyengaged in said last-named grooves to support said last-named luglaterally on the bar for engaging said first-named lug.

3. A page end alarm for typewriters having a carriage provided with aplaten, said platen having an annular groove normally covered by a sheetof paper placed thereon, a bell mounted on a stationary part of themachine and including a pivoted clapper having a laterally projectinglug at one end, a bar having a laterally projecting lug, means forpivotally suspending the bar on the carriage for swinging movementtoward and away from the lug of the clapper to move the lug of the barinto and out of position to engage said lug of theclapper duringmovement of the carriage, a link pivoted at one end to the means, a bellcrank lever connected to the other end of the link and having one endadapted to enter the groove when uncovered by the end of the sheet, andspring means for actuating the lever in a direction to cause engagementof said lugs.

4. A page end alarm for typewriters having a carriage provided with aplaten, said platen having an annular groove normally covered by a sheetof paper placed thereon, a bell mounted on a stationary part of themachine and including a pivoted clapper having a laterally projectinglug at one end, a bar pivotally suspended on the carriage for forwardand rearward swinging movement, normally inactive means connected to thebar and operable to enter the groove upon uncovering thereof by thepaper to swingably actuate the bar rearwardly toward said lug of theclapper, manually operable means to hold the first means retracted fromthe groove, and the bar at a distance from the clapper, and a luadjustably carried by the bar for engaging said first-named lug.

EDWARD T. WICKLAND.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,088,865 Bancroft Mar. 3, 19141,838,881 Taylor Dec. 29, 1931 478,223 Clemons July 5, 1892 1,594,768Block Aug. 3, 1926 1,053,922 Neidig Feb. 18, 1913 2,156,475 Helmond May2, 1939 FOREIGN PATENTS Number Country Date 53,974 Austrian Of 1912

